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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Common Stock, No Par Value $ 149,739 $ 148,668
Retained Earnings 51,062 48,623
TOTAL COMMON EQUITY 200,801 197,291
TOTAL PREFERRED STOCK 2,436 2,436
SUBTOTAL LONG-TERM DEBT 139,943 140,029
Add: Premium on Issuance of Long-term Debt 1,814 1,920
Less: Current Portion of Long-term Debt (5,692) (5,910)
TOTAL LONG-TERM DEBT 136,065 136,039
Convertible Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 1,007 1,007
Convertible Preferred Stock $8.00 Series [Member]    
TOTAL PREFERRED STOCK 349 349
Nonredeemable Preferred Stock $7.00 Series [Member]    
TOTAL PREFERRED STOCK 80 80
Nonredeemable Preferred Stock $4.75 Series [Member]    
TOTAL PREFERRED STOCK 1,000 1,000
Amortizing Secured Note, due December 20, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 1,730 1,825
Amortizing Secured Note, due May 19, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 5,425 5,635
Amortizing Secured Note, due August 25, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 4,247 4,387
Amortizing Secured Note, due September 19, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 4,527 4,667
State Revolving Trust Note, due December 31, 2022 [Member]    
SUBTOTAL LONG-TERM DEBT 399 421
State Revolving Trust Note, due May 1, 2025 [Member]    
SUBTOTAL LONG-TERM DEBT 2,366 2,463
State Revolving Trust Note, due March 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 487 506
State Revolving Trust Note, due January 25, 2027 [Member]    
SUBTOTAL LONG-TERM DEBT 518 536
State Revolving Trust Note, due December 1, 2026 [Member]    
SUBTOTAL LONG-TERM DEBT 674 697
State Revolving Trust Bond 4.00% to 5.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 299 299
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]    
SUBTOTAL LONG-TERM DEBT 236 241
State Revolving Trust Note, due July 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 304 313
State Revolving Trust Note, due January 1, 2028 [Member]    
SUBTOTAL LONG-TERM DEBT 101 104
State Revolving Trust Note, due August 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 1,090 1,115
Amortizing Secured Note, due April 20, 2029 [Member]    
SUBTOTAL LONG-TERM DEBT 4,825 4,999
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 3,646 3,771
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 7,479 7,735
Amortizing Secured Note, due April 20, 2040 [Member]    
SUBTOTAL LONG-TERM DEBT 10,927 8,000
State Revolving Trust Note, due July 1, 2031 [Member]    
SUBTOTAL LONG-TERM DEBT 2,357 2,411
State Revolving Trust Note, due November 30, 2030 [Member]    
SUBTOTAL LONG-TERM DEBT 1,246 1,276
First Mortgage Bonds - Series X [Member]    
SUBTOTAL LONG-TERM DEBT 211 215
First Mortgage Bonds - Series Y [Member]    
SUBTOTAL LONG-TERM DEBT 245 245
First Mortgage Bonds - Series Z [Member]    
SUBTOTAL LONG-TERM DEBT 548 559
First Mortgage Bonds - Series AA [Member]    
SUBTOTAL LONG-TERM DEBT 700 700
First Mortgage Bonds - Series BB [Member]    
SUBTOTAL LONG-TERM DEBT 827 845
First Mortgage Bonds - Series CC [Member]    
SUBTOTAL LONG-TERM DEBT 1,025 1,025
First Mortgage Bonds - Series EE [Member]    
SUBTOTAL LONG-TERM DEBT 3,468 3,550
First Mortgage Bonds - Series FF [Member]    
SUBTOTAL LONG-TERM DEBT 3,690 4,900
First Mortgage Bonds - Series GG [Member]    
SUBTOTAL LONG-TERM DEBT 1,064 1,083
First Mortgage Bonds - Series HH [Member]    
SUBTOTAL LONG-TERM DEBT 1,390 1,390
First Mortgage Bonds - Series II [Member]    
SUBTOTAL LONG-TERM DEBT 861 881
First Mortgage Bonds - Series JJ [Member]    
SUBTOTAL LONG-TERM DEBT 1,090 1,090
First Mortgage Bonds - Series KK [Member]    
SUBTOTAL LONG-TERM DEBT 1,233 1,255
First Mortgage Bonds - Series LL [Member]    
SUBTOTAL LONG-TERM DEBT 1,435 1,435
First Mortgage Bonds - Series MM [Member]    
SUBTOTAL LONG-TERM DEBT 1,504 1,537
First Mortgage Bonds - Series NN [Member]    
SUBTOTAL LONG-TERM DEBT 1,755 1,755
First Mortgage Bonds - Series OO [Member]    
SUBTOTAL LONG-TERM DEBT 2,508 2,559
First Mortgage Bonds - Series PP [Member]    
SUBTOTAL LONG-TERM DEBT 850 850
First Mortgage Bonds - Series QQ [Member]    
SUBTOTAL LONG-TERM DEBT 9,915 9,915
First Mortgage Bonds - Series RR [Member]    
SUBTOTAL LONG-TERM DEBT 22,500 22,500
First Mortgage Bonds - Series SS [Member]    
SUBTOTAL LONG-TERM DEBT 23,000 23,000
First Mortgage Bonds - Series TT [Member]    
SUBTOTAL LONG-TERM DEBT 2,659 2,709
First Mortgage Bonds - Series UU [Member]    
SUBTOTAL LONG-TERM DEBT 975 975
First Mortgage Bonds - Series VV [Member]    
SUBTOTAL LONG-TERM DEBT 2,672 2,720
First Mortgage Bonds - Series WW [Member]    
SUBTOTAL LONG-TERM DEBT $ 935 $ 935